Annals of the South African MuseumThe Museum, 1991 - Natural history |
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Page 10
... obsolete , nodose flank costae oblique , escutcheon sometimes with transverse costellae , longitudinal furrow to area often delimited by row of nodes ; 3 = flank costae form chevrons near umbo ; 4 large , massive , carinae breaking up ...
... obsolete , nodose flank costae oblique , escutcheon sometimes with transverse costellae , longitudinal furrow to area often delimited by row of nodes ; 3 = flank costae form chevrons near umbo ; 4 large , massive , carinae breaking up ...
Page 24
... obsolete , or entire and restricted to umbonal region ; antecarinal sulcus lacking ; area narrow , bipartite , with ridge marking longitudinal groove internally ; area com- monly smooth but in some with transverse , oblique or radial ...
... obsolete , or entire and restricted to umbonal region ; antecarinal sulcus lacking ; area narrow , bipartite , with ridge marking longitudinal groove internally ; area com- monly smooth but in some with transverse , oblique or radial ...
Page 25
... obsolete or restricted to nepionic stages , marginal carina often restricted to umbonal region , anteriorly produced so that umbones are generally not subterminal , area rela- tively narrow with concentric ornament in nepionic stages ...
... obsolete or restricted to nepionic stages , marginal carina often restricted to umbonal region , anteriorly produced so that umbones are generally not subterminal , area rela- tively narrow with concentric ornament in nepionic stages ...
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Common terms and phrases
Algoa Basin Anditrigonia antecarinal sulcus anterior commissure anterolateral shoulder anteroventrally Apiotrigoniinae Bivalvia broad chevrons coarse commissure comprises convex Cooper Cretaceous Description Shell Diagnosis elongate escutcheon carina faunas finely crenulated flank costae flank ornament genus growth rugae growth striae Hauterivian Hoepen holotype inflated anteriorly interspaces Iotrigonia irregular Kobayashi kraussi Kitchin lanceolate large maximum length Lateral view lectotype left valve longitudinal groove Megatrigoniacea moderately Myophorella Myophoriidae Nakano neotype nepionic stages Neumayr nodate Nototrigoniinae opisthogyrous beaks Paranditrigonia paratypes persisting to maturity phyletic Port Elizabeth Museum posterior set posterodorsal margin Poulton Pterotrigonia radial costellae radial ornament Rennie respiratory margin Reyes ribs right valve rostrate shallowly concave shell length Skwarko smooth South African Museum Steinmanella herzogi Goldfuss straight strongly oblique subconcentric subfamily Sundays River Superfamily synonymy Tashiro Tithonian transverse costellae transverse ornament Trigonia Trigoniacea Trigoniinae trigonioid tubercles Type species Upper Valanginian V-shaped Valanginian vau Sharpe ventral margin ventricosa Krauss Yaadia